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Notes Payable (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2017	Mar. 08, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Liabilities fair value		$ 1,323		$ 785
Notes payable, principal		375,000		320,000
Unamortized discount and debt issuance costs		3,665		0
Notes payable		371,335		320,000
Secured Notes One [Member]
Debt Instrument [Line Items]
Secured loan				120,000
Secured Notes Two [Member]
Debt Instrument [Line Items]
Secured loan				20,000
Level 2 [Member]
Debt Instrument [Line Items]
Liabilities fair value		1,200		765
Level 2 [Member] | Secured Notes One [Member]
Debt Instrument [Line Items]
Secured loan		0		120,000
Level 2 [Member] | Secured Notes Two [Member]
Debt Instrument [Line Items]
Secured loan		0		20,000
Unsecured Debt [Member]
Debt Instrument [Line Items]
Liabilities fair value		375,000
Interest rate, stated percentage			4.40%
Unsecured Debt [Member] | Borrowings [Member]
Debt Instrument [Line Items]
Liabilities fair value		385,583		180,000
Notes payable		371,335		180,000
Unsecured Debt [Member] | Borrowings [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Liabilities fair value		385,583		180,000
Unsecured Debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes One [Member]
Debt Instrument [Line Items]
Liabilities fair value		0		180,000
Unsecured Debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes Two [Member]
Debt Instrument [Line Items]
Unsecured debt		375,000		0
Interest rate, stated percentage	4.40%
Unsecured Debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes Three [Member]
Debt Instrument [Line Items]
Liabilities fair value		$ 0		$ 0
LIBOR [Member] | Level 2 [Member] | Secured Notes One [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.40%
LIBOR [Member] | Level 2 [Member] | Secured Notes Two [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.40%
Minimum [Member] | LIBOR [Member] | Unsecured Debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes One [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.1125%
Minimum [Member] | LIBOR [Member] | Unsecured Debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes Three [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.1125%
Maximum [Member] | LIBOR [Member] | Unsecured Debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes One [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.1625%
Maximum [Member] | LIBOR [Member] | Unsecured Debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes Three [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.1625%

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